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The book, which has been written by two journalists from German newspaper Der Spiegel, alleges the Italian-born, Dutch-based agent will receive payments for acting for the buying and selling club, as well as the player.

Paul Pogba celebrates with goalscorer Henrikh Mkhitaryan after the latter scored their second goal during the Premier League match between Sunderland and Manchester United at Stadium of Light on April 9, 2017

He said: “The same as FIFA wants to be transparent in our accounts, I think it’s also a duty for the clubs, the agents and all those who are serious, that maybe we can come to some better way of dealing with this. How we’ll decide for this to happen and when it will happen, I don’t know.”

This light-touch approach has been criticised in several countries and only this week the association of Italian football agents has asked a court in Rome to impose tighter rules on who can represent players.

Manchester United's Zlatan Ibrahimovic and team-mate Paul Pogba

Manchester United have denied any wrongdoing in the Pogba transfer and appear to be relaxed about FIFA’s interest in the move.

Raiola has not commented on the recent claims about his earnings – he also represents Pogba’s Manchester United team-mates Zlatan Ibrahimovic and Henrikh Mkhitaryan – but has defended himself in previous newspaper interviews.

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But there is clearly some momentum for a review of how agents earn their money and the sums involved.

Speaking to the BBC in Bahrain, Football Association chairman Greg Clarke said it was up to Manchester United how much they spent on players and agents but perhaps it was something that could be discussed by all parties in the professional game.

Clarke said: “Picking on one transfer and demonising it is not that helpful – knee-jerk reactions don’t often yield good outcomes.

“What we want is some thought about how much money stays in the game so it can be invested in long-term productive things.”